I am bipolar also and have been on Seroquel for over a decade, having said that, everyone reacts differently to medications (benefits, risks, side effects, interactions, etc... ). With regards to you being irritable this is a side effect you must inform to your Dr. on Monday , but at least in my case it subsided with a couple of weeks.
The dreams, they, again, in my case come and go if I sleep, I do too suffer from insomnia.
As I mentioned we are all different, you know that, so they may come and go like in my case or simply remain as a part of your treatment or not, you have to wait and give it some time, it´s, as you put it only been 2 days.
Here are some useful links for you:
Welcome to the site, masso.-